Fuel cell AC impedance on-line testing system and measuring and controlling method

Abstract

The invention relates to a fuel cell AC impedance on-line testing system and a measuring and controlling method thereof. The system comprises a program-controlled alternating current (AC) source, a blocking capacitor, a main controller, a CAN bus and a plurality of AC impedance testing units. Each AC impedance testing unit is used for detecting n chips of fuel cell AC impedances connected in series. The measuring and controlling method of the system has two working modes, which are a dynamic measuring and controlling mode and a static measuring and controlling mode. Under a dynamic measuring and controlling mode, when a fuel cell stack generates power, the main controller controlls the AC source and the AC impedance testing units through the CAN bus, measurement is carried out, measurement data is collected, such that AC impedance spectrums of all the single-chip fuel cells are obtained. Under the static measuring and controlling mode, when the fuel cell stack does not generate, the testing upon AC impedance of fuel cells with any number at a certain fixed frequency point is set manually. The system and the method provided by the invention are advantaged in simple circuit, high measurement precision, and high reliability. With the system and the method, real-time and high-precision testing requirements of fuel cell AC impedance can be satisfied.

Description

technical field [0001] The invention belongs to an on-line test system and a measurement and control method for the AC impedance of a series power supply unit, in particular to an on-line test system and a measurement and control method for the AC impedance of a fuel cell. Background technique [0002] A fuel cell is a device that converts chemical energy stored in fuel and oxidant into electrical energy through an electrochemical reaction. According to the fuel cell power requirements in practical applications, the fuel cell stack is usually composed of several to hundreds of single cells in series. During the operation of the fuel cell, the abnormality of a single cell will affect the performance and safety of the entire stack. Therefore, In order to ensure the efficient operation of fuel cells, real-time monitoring of each individual fuel cell is necessary. Undoubtedly, the AC impedance of the fuel cell is the key data of the power generation performance of the fuel cell...

AI Technical Summary

Problems solved by technology

[0003] The current impedance test equipment for fuel cells has some shortcomings, such as: the equipment can only be measured in the laboratory environment of the experiment, and cannot be tested online in real time; it can only test the impedance of a single fuel cell, and cannot meet the simultaneous measurement of multiple fuel cells at the same time; Can only test the impedance value of the fuel cell at a certain frequency point

Moreover, these devices generally include high-end complex instruments such as fuel cell test benches, electronic loads, and frequency analyzers, which require technicians to correctly configure their hardware connections, software programs, and interface communication protocols, which makes this type of test operation complex and costly. high

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